[MacPorts] #64169: go can't be built on macOS 10.6 i686

[MacPorts]

#64169: go can't be built on macOS 10.6 i686
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  Reporter:  catap   |      Owner:  ci42
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  snowleopard
      Port:  go      |
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Comment (by barracuda156):

 The issue is that `GOARCH` is ignored by the build system, even with Go
 1.14.15, which does support `i386`. Not sure why.

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Ticket URL: <https://trac.macports.org/ticket/64169#comment:12>
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